If Naruto had some super powerful jutsu, then he could have used it to help Shikamaru fight against the 2 akatsuki guys (i forgot their names already) instead of training for Rasen-Shuriken which would never have happened had he already learn a powerful jutsu. Well, he can still learn it, but he'd probably learn it later on seeing as with the time he used to train, he could have been helping Shikamaru.